IP Library › Granted Patent US 5,085,899
Granted Patent Utility
US 5,085,899 · App. 07/228,577

Dust-proof film

Inventors: Hiroaki Nakagawa, Yoichi Takehana
Patented Case View Patent ↗
Granted: Feb 4, 1992 Filed: Aug 5, 1988
Inventors
Hiroaki Nakagawa
Yoichi Takehana
Assignees (at issue)
Mitsui Petrochemical Industries, Ltd.
HITACHI, LTD.

This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 5,085,899
App. No.
07/228,577
Filed
1988-08-05
Granted
1992-02-04
Kind
A